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Walter Roberson
Walter Roberson 2018-3-6

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dmin = min(data(:));
dmax = max(data(:));
scaled_data = (data - dmin)./(dmax - dmin) * 2 - 1;
or more simply,
scaled_data = mat2gray(data) * 2 - 1;
Multiply by 2 and subtract 1 is a very convenient mapping from [0 1] to [-1 1]

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